What is the white powdery substance under bathroom sink?

Anonymous
Are you guys positive it’s shedding from the marble? Because I have white bathroom dust and it is…toilet paper dust. I know this because I kept a lidded trash can underneath the roll and had to dust it constantly. Finally I realized the dust was being shed by the roll. Costco brand, if anyone wonders.
Anonymous
This is just dust from the marble.
Anonymous
Would grout spray help? I’ve been in my home for 3 mos (new build) and it’s so annoying
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